【作者】 王欢；

【导师】 胡平放；

【作者基本信息】 华中科技大学 ， 建筑与土木工程， 2019， 硕士

【摘要】 地源热泵空调系统作为地热能的一种利用形式,近些年得到了大力的发展,越来越多的建筑采用地源热泵空调系统,但目前大多数公共建筑采用的全空气定风量空调系统,其能耗过大,不利于节能。本文对武汉某写字楼建立了具体的TRNSYS分析模型,从能分析和?分析角度对变风量、变流量空调系统进行了研究,并分析了风系统和水系统的最优运行温度组合。研究发现,在设计工况下,该建筑原采用的定风量、定流量空调系统制冷季和制热季能效比为2.17和1.46,?效率为7.60%和3.93%;改用变风量、变流量空调系统,并将设计温度参数作为实际运行温度参数后,系统能效比变为3.70和3.48,?效率变为11.43%和4.12%,系统能效比和?效率明显提升。基于TRNSYS模型,以该写字楼建筑为优化对象,对传统设计的风系统和水系统参考温度进行了分析研究。研究发现,传统设计送风温差10℃以内,水系统温差5℃的组合不一定是最节能的运行方式。通过改变送风温度、负荷侧水系统供回水温度、地源测水系统供回水温度,可以找到空调系统在最节能工况运行下的温度组合。本文首先确定了风系统和水系统温度变化范围,采用拉丁超立方抽样方法抽取部分样本进行模拟,其次利用BP神经网络原理建立温度组合参数和空调系统能效比之间的关系,最后运用基于神经网络遗传算法的全局寻优原理,找到全局系统能效比最优情况下对应的温度组合。模拟结果表明,该建筑的空调系统最佳组合运行温度为:制冷季送风温差11.7℃,负荷侧热泵出水温度5.9℃,负荷侧温差7.0℃,地源测热泵回水温度23.4℃,地源测温差6.6℃;制热季送风温差10.8℃,负荷侧热泵出水温度43.4℃,负荷侧温差6.4℃,热泵测回水温度13.5℃,地源测温差7.4℃。本文从能分析和?分析的角度对地源热泵暖通空调系统进行了研究,分析了变风量、变流量系统最优温度组合,对以后空调系统运行温差的设置提供了参考。更多还原

【Abstract】 Ground-source heat pump air-conditioning system,as a form of utilization of geothermal energy,has been vigorously developed in recent years.More and more buildings use ground-source heat pump air-conditioning systems,but most of the public buildings use air-conditioning systems.Excessive energy consumption is not conducive to energy conservation.Taking the ground source heat pump air conditioning system of a public building in Wuhan as an example,the simulation model of the system is established by using dynamic simulation software TRNSYS The energy consumption,exergy efficiency and equivalent carbon dioxide emission of vav and VAV systems are analyzed and simulated,and the optimum temperature combination of air system and water system is studied.It is found that under the design condition,the efficiency ratio of constant air volume and constant flow air conditioning system used in the building in cooling season and heating season is 2.32 and 1.27,and the efficiency ratio is 8.52% and 1.65%,and the variable air volume and variable flow air conditioning system is used instead After the design temperature was taken as the actual operating temperature parameter,the energy efficiency ratio(er)of the system was changed to 3.22 and 3.17,and the Er and er of the system were improved to 10.87% and 17% respectively.Based on the TRNSYS model,the reference temperature of wind system and water system of the office building is analyzed and studied.It is found that the combination of water system temperature difference of 5℃ is not necessarily the most energy-saving operation mode within 10℃ of the traditional design air supply temperature difference.By changing the supply air temperature,the supply and return water temperature of the water system on the load side and the supply and return water temperature of the ground source water measuring system,the temperature combination of the air conditioning system under the most energy-saving operating condition can be found.In this paper,the temperature variation range of wind system and water system is firstly determined,and some samples are sampled by Latin hypercube sampling method Secondly,the relationship between the temperature combination parameters and the energy efficiency ratio of the air-conditioning system is established by using the BP neural network principle The temperature combination corresponding to the optimal energy efficiency ratio of the global system is found.The simulation results show that the optimal combined operating temperature of the building’s air conditioning system is 11.7℃ in cooling season,5.9℃ in the load side,7.0℃ in the load side and 23.4℃ in the return water temperature of ground source heat pump The temperature difference of ground source is 6.6℃,the temperature difference of air supply is 10.8℃ in heating season,the temperature difference of heat pump outlet water on the load side is 43.4℃,the temperature difference of heat pump return water on the load side is 6.4℃,the temperature difference of heat pump return water is 13.5℃,and the temperature difference of ground source is 7.4℃.In summary,this paper studies the ground-source heat pump air conditioning system from the point of view of energy analysis and analysis,and analyzes the optimal temperature combination of variable air volume and variable air volume system It provides a reference for setting the operating temperature difference of air conditioning system in the future.更多还原